Key Area 4: Conformers And Regulators Flashcards

1
Q

What are three abiotic factors?

A
  • temperature
  • salinity
  • pH
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2
Q

What is a conformer?

A

An organism that maintain their internal conditions to the same as the external environment

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3
Q

Give one advantage and one disadvantage of conformers

A
  • expends little energy controlling internal conditions

- narrow range of ecological niches

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4
Q

What is a regulator?

A

Organisms that maintain a steady internal environment despite changes in the external environment

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5
Q

Give one advantage and one disadvantage of regulators

A
  • wider range of ecological niches

- required high energy expenditure

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6
Q

Give an example of a conformer

A

??

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7
Q

What is an ectotherm?

A

Their body temperature varies with that of their surroundings

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8
Q

What is an endotherm?

A

They maintain a constant body temperature deriving heat from metabolism

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9
Q

What groups of animals are ectothermic?

A
  • reptiles
  • fish
  • amphibians
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10
Q

What groups of animals are endothermic?

A
  • birds

- mammals

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11
Q

What is homeostasis?

A

The maintenance of stable body conditions

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12
Q

What is negative feedback control?

A

The process of maintaining homeostasis

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13
Q

Where is the body temperature in endotherms monitored?

A

Hypothalamus (in the brain)

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14
Q

How does the brain send signals to correct change in temperature?

A

chemical messages though the nerves

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15
Q

How does the body correct increased temperature?

A
  • vasodilation where capillaries dilate so blood gets to the surface and radiates heat through the skin
  • swear glands produce more water which takes heat energy from the skin to evaporate
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16
Q

How does the body correct decreased temperature?

A
  • skeletal muscles bit are to create friction which produces heat to warm the body
  • hair erector muscles contract to trap air on the surface of the skin and hairs stand on end
  • capillaries constrict to reduce blood going to the surface of the skin
17
Q

How do ectothermic regulate body temperature?

A

Through change in behaviour

18
Q

What is important about endothermic metabolic reactions?

A

Body temperature must be constant for metabolic reactions